How can a equation have many solutions

A student solved the problem below. Is the student's answer correct? $1.00 + $0.45 + $0.50 = $1.45 + $0.50 = $1.50 No, the student should have added $0.45 and $0.50 first. No, the student subtracted instead of added.

What fraction of 1 quart is 3 cups

This net can be folded to form a cube with a side length of 20 units. A cube has side lengths of 20 units. What is the surface area of the cube in square units? 1,400 square units 2,400 square units 4,800 square units 8,000 square units

What is the answer to: (51 + 11.22 + 35.92) ?

8^x = 2 what is the value of x

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.